Free shipping is an excellent incentive for any customer to complete a purchase.

As an eCommerce if you're looking to avoid a high abandon cart rate do your best to factor in free shipping to your pricing. Those two simple words will do wonders for your site and the increase in sales. 'Free Shipping'

No customer wants to add an item to their cart, go through the process of purchasing and then get hit with shipping costs. They'll be hitting that X button quicker than you think.

Do your best as an eCommerce to make the buying process as easy as possible for your customers.

Insightful data @Parcelhub! We have seen some of the largest eCommerce businesses which grew fast provide Free Shipping with a rider - Minimum Purchase worth $N

This way, you provide a reward/benefit to your best customers. It even becomes a conversion hack. Customers would often buy some accessories to go with the main product to cross the Free Shipping bar and hence a Win-win.

We would strongly recommend having either Free Shipping coupons which talk about the minimum purchase. or make it a standard practice and make it prominent in your website that you provide free shipping of any order amount above lets say $150 as an example.

Here's an example from Bolder Band, a multi million dollar store which launched in late 2013